The Viscount's Deadly Game. The Discreet Investigations of Lord and Lady Calaway, #2

Who killed Viscount Beaconberg? Lady Beaconberg's a prime suspect: the money-grabbing snob of a wife would do anything to get further up the social ladder, and ditching a lowly viscount would free her for marriage to a much more esteemed nobleman. Or perhaps the killer was the viscount's business partner, Sir Arthur, who's been arguing in public and in private, desperate to wrest control of the racing stables fully into his own hands. As Theodore Caxton, the Earl of Calaway and his wife Adelia look further into the viscount's suspicious death, more secrets emerge from the family's past.
Everyone had someone to gain from the murder. How far will the killer go to hide the truth? Theodore's a man of learning and science; Adelia's got a gift for reading people and asking the right questions. Together they get dangerously close to the murderer. When events separate them - one on a wild chase across the northern moors of England, the other into the heart of horse racing at York - can they each survive on their own? They cannot afford to be losers in this deadly game of murder, love and money.